The Introduction Client in Briar through 1.5.3 does not implement out-of-band…
Priority LOW 35CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-862.
Summary
The Introduction Client in Briar through 1.5.3 does not implement out-of-band verification for the public keys of introducees. An introducer can launch man-in-the-middle attacks against later private communication between two introduced parties.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00591 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:briarproject:briar:*:*:*:*:*:*:*:* | up to 1.5.3 | Vulnerable | Briarproject |
- cpe:2.3:a:briarproject:briar:*:*:*:*:*:*:*:* Versions up to 1.5.3 Vulnerable ·Briarproject
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-33983
- 2026-10-03 Alias added: GHSA-3jcf-wh8c-cfcc
References
More Briarproject Briar vulnerabilities
- TI-2023-16847 Bramble Synchronisation Protocol (BSP) in Briar before 1.4.22 allows attackers to cause a… CVSS 3.1HIGH 7.5
- TI-2023-16848 Briar before 1.4.22 allows attackers to spoof other users' messages in a blog, forum, or… CVSS 3.1MEDIUM 6.5
- TI-2023-16849 Bramble Handshake Protocol (BHP) in Briar before 1.5.3 is not forward secure… CVSS 3.1MEDIUM 5.9
Sources
- CVE-2023-33983 · CVE Program
- CVE-2023-33983 · NVD
- FIRST EPSS
- GHSA-3jcf-wh8c-cfcc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences